XDepth 48 is a new technology that allows JPEG images to reach a maximum of 16 bit for each RGB component. XDepth 48 employs the same image reconstruction algorithm offered with XDepth Raw, thus avoiding common JPEG and JPEG2000 artifacts. It also offers improved compression of files, with XDepth asserting that a 48bit TIFF of 6088x4550 pixels would be 166MBs in size, with the equivalent XDepth 48 JPEG only being 17MBs. Further details are scarce, but there is a full-sized sample available for download.
Website: XDepth 48